#include<bits/stdc++.h>
using namespace std;

int main(){
    // 大象喝水
    int s = 20000;
    double pi = 3.14159;
    int h,r;
    cin >> h >> r;
    double v = pi * r * r * h;
    int ans = s / v + 1;
    cout << ans; 
    return 0;
}